package org.redhat.auth.security.core;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.access.method.MethodSecurityMetadataSource;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

/**
 * 自定义实现的一个Filter,用于实现SPRING SECURITY用户从数据库中读取，资源定义从数据库中读取，决策自实现三个功能
 * 
 * @author lingen.liu
 * 
 */
public class AuthFilterSecurityInterceptor extends AbstractSecurityInterceptor
		implements Filter {

	private FilterInvocationSecurityMetadataSource securityMetadataSource ;
	

	@Override
	public Class<? extends Object> getSecureObjectClass() {
		return FilterInvocation.class;
	}

	@Override
	public SecurityMetadataSource obtainSecurityMetadataSource() {
		return this.securityMetadataSource;
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain filterChain) throws IOException, ServletException {
		FilterInvocation fi = new FilterInvocation(request, response,
				filterChain);
		invoke(fi);
	}

	public void invoke(FilterInvocation fi) throws IOException,
			ServletException {
		InterceptorStatusToken token = super.beforeInvocation(fi);
		try {
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		} finally {
			super.afterInvocation(token, null);
		}

	}

	public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
		return securityMetadataSource;
	}

	public void setSecurityMetadataSource(
			FilterInvocationSecurityMetadataSource securityMetadataSource) {
		this.securityMetadataSource = securityMetadataSource;
	}

	@Override
	public void destroy() {
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		
	}

}